doc: fix incorrect method name

PR-URL: https://github.com/nodejs/node/pull/21908


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Lance Ball <lball@redhat.com>
Reviewed-By: James M Snell <jasnell@gmail.com>